Fix typo in 022_twophase_cascade.pl.

Author: Peter Smith
Discussion: https://postgr.es/m/CAHut+Pta=zo8G1DWVVg-LU6b_JvHHCueC=AKVpKJOrwLzj9EZA@mail.gmail.com

Author: Amit Kapila

src/test/subscription/t/022_twophase_cascade.pl

@@ -48,7 +48,7 @@
 $node_A->safe_psql('postgres', "
 	INSERT INTO tab_full SELECT generate_series(1,10);");
 
-# Create the same tables on node_B amd node_C
+# Create the same tables on node_B and node_C
 $node_B->safe_psql('postgres',
 	"CREATE TABLE tab_full (a int PRIMARY KEY)");
 $node_C->safe_psql('postgres',